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...Both are mainly zinc mines, although Greens Creek produces other metals, including silver, and Red Dog is a major leadproducer as well as zinc. Red Dog received permission to develop a new ore body adjacent to its original mining pit, which...

...the CDC's criteria of 25 micrograms of lead per deciliter of blood. The Greens Creek mine near Juneau, another leadproducer, also monitors blood lead levels. The program flags workers when their lead level reaches 20 micrograms per deciliter...